Finding the Fourth Proportional to 10,453.30, 15,671.72 and 7,156.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,453.30 : 15,671.72 = 7,156.40 : x
2. Step 2: Convert to fraction form
   10,453.30/15,671.72 = 7,156.40/x
3. Step 3: Cross multiply
   10,453.30x = 15,671.72 × 7,156.40
4. Step 4: Simplify right side
   10,453.30x = 112,153,097.01
5. Step 5: Solve for x
   x = 112,153,097.01/10,453.30
6. Step 6: Final answer
   x = 10,728.97